What is a normal BASDAI score?

There is no single "normal" value. A score below 2.0 suggests low or remission-level disease activity; 2.0–3.9 indicates moderate activity; 4.0 and above indicates active disease. A score of 4 or higher is commonly used as a threshold for considering biologic therapy.

How is the BASDAI score calculated?

Six questions are each rated 0–10. Questions 5 and 6 (morning stiffness severity and duration) are averaged first. The final score is the mean of Q1, Q2, Q3, Q4, and the Q5/Q6 average — giving a total out of 10.

How often should I calculate my BASDAI?

Most rheumatologists recommend tracking BASDAI at every clinic visit (typically every 3–6 months). More frequent self-monitoring can help you and your doctor detect flares earlier.

Is BASDAI the same as ASDAS?

No. BASDAI is entirely patient-reported, while ASDAS (Ankylosing Spondylitis Disease Activity Score) incorporates a blood marker (CRP or ESR) alongside patient questions. Both are validated; your rheumatologist may use one or both.

Can I use this calculator instead of seeing a doctor?

This tool is for informational and tracking purposes only. It does not replace a clinical assessment. Always discuss your score and symptoms with a qualified rheumatologist before changing treatment.

What does the morning stiffness duration question mean?

Question 6 asks how long your morning stiffness lasts on a scale of 0 (none) to 10 (2 or more hours). Rate 0 for no stiffness, 5 for approximately 1 hour, and 10 for 2 hours or more.

BASDAI Spondylitis Score Calculator

Name: BASDAI Spondylitis Score Calculator
Availability: InStock
Author: Nham Vu

Enter six symptom severity ratings to calculate your BASDAI score and assess ankylosing spondylitis disease activity.

Rate Your Symptoms

Rate each symptom over the last week on a scale of 0 (none) to 10 (very severe).

1 Fatigue / tiredness 0

None (0)Very severe (10)

2 Neck, back, or hip pain 0

None (0)Very severe (10)

3 Pain or swelling in other joints 0

None (0)Very severe (10)

4 Discomfort from tender areas (enthesitis) 0

None (0)Very severe (10)

5 Morning stiffness severity 0

None (0)Very severe (10)

6 Morning stiffness duration (0 = none, 10 = 2+ hrs) 0

None (0)2+ hours (10)

BASDAI Score Result

Your BASDAI Score

—

out of 10

0410

Score Breakdown

Component	Value
Q1 — Fatigue	—
Q2 — Spinal pain	—
Q3 — Peripheral joint pain	—
Q4 — Enthesitis	—
Q5+Q6 avg — Morning stiffness	—
BASDAI Total	—

This calculator is for informational purposes only and does not constitute medical advice. Consult a qualified rheumatologist for diagnosis and treatment decisions.

BASDAI Interpretation Guide

0 – 1.9 — Inactive / remission

2.0 – 3.9 — Moderate disease activity

4.0 – 10 — Active disease; treatment review recommended

Summary

Enter six symptom severity ratings to calculate your BASDAI score and assess ankylosing spondylitis disease activity.

How it works

Rate each of the six symptom domains on a 0–10 numeric scale using the sliders.
Questions 5 and 6 address morning stiffness severity and duration respectively.
The calculator averages questions 5 and 6 into a single combined morning stiffness value.
The final BASDAI score is the mean of the five resulting values (Q1, Q2, Q3, Q4, and the Q5/Q6 average).
A score of 4.0 or higher typically indicates active disease warranting treatment review.
Results are shown instantly with an interpretation band and color indicator.

Use cases

Patients monitoring their own ankylosing spondylitis disease activity over time.
Rheumatologists screening patients to determine eligibility for biologic therapy.
Tracking response to NSAIDs, DMARDs, or anti-TNF treatment regimens.
Clinical research requiring standardized AS activity scores.
Telemedicine consultations where a validated self-reported score is needed.
Pre-appointment preparation so patients arrive with a documented score.
Health educators explaining how BASDAI scoring works to patients.
Medical students learning rheumatology assessment tools.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu